Roll storage means



Dec. 29, 1964 E. R. Hol-:NLE

ROLL STORAGE MEANS I5 Sheets-Sheet l Filed May l5, 1961 E. R. HOENLEROLL STORAGE MEANS Dec. 29, 1964 3 Sheets-Sheet 2 Filed May l5, v1961 F32 57 58 IN VEN TOR.

56 BYQO Hb@ 7 ZQ,

32 pmfmq) Dec. 29, 1964 E. R. HoENLE 3,163,480

ROLL STORAGE MEANS Filed May 15, 1961 3 Sheets-Sheet 3 IN V EN TOR.

BY DOUAB' Mg 3,l63,480 BULL STORAGE MEANS Egon R. Hoenle, Two Rivers,Wis., assigner to Hamilton Manufacturing Company, Two Rivers, `Wis., acorporation of Wisconsin Filed May 15, i961, Ser. No. 110,039 11 Claims.(Cl. S12-319) This invention relates to improvements in storage devicesor files for rolls of drawings or other elongated cylindrical articles.

A roll le unit ofthe type involved in the present invention comprisesgenerally a rectangular frame or housing containing a plurality ofelongated tubular compartments accessible from the front of the unit forinserting or removing rolled articles such as drawings, plans,blueprints, tracings, etc. A door is preferably provided at the front oftheunit, and usually the units are of modular design so that a pluralityof units may be stacked or otherwise connected to form a unitarycabinet.

One object of the present invention is to provide a novel and improveddoor mounting arrangement for a roll file unit of the aforementionedtype.

Another object of the invention is to provide, in a roll tile unit ofthe type described, novel and improved means for retaining the tubularstorage compartments in the frame ofthe unit.

A further object of the invention is to provide a roll le unit of thetype described wherein the frame and the door lof the unit cooperate ina novel and improved manner with opposite ends of the tubular storagecompartments for retaining the latter in the frame.

Another object of the invention is to provide novel and improved meansfor detachably interconnecting a plurality of roll tile units of thetype described.

Other objects and advantages of the invention will become apparent fromthe subsequent detailed description taken in conjunction with theaccompanying drawings, wherein:

FIG. l is a perspective view of an assembly of roll tile units embodyingthe features of the present invention;

FIG. 2 is an enlarged vertical sectional view as taken substantiallyalong the line 2 2 of FIG. l withiintermediate portions broken away;

FIG. 3 is an enlarged vertical sectional view as taken substantiallyalong the line 3 3 of FIG. l with intermediate portions broken away; i

FIG. 4 is a fragmentary horizontal sectional View as taken along theline 4 4 of FIG 3;

FIG. 5 is an enlarged plan view of a single roll le unit withintermediate portions broken away and with portions in section to revealinternal details of construction;

FIG. 6 is axvertical sectional View taken along the line 6 6 of FIG. 5;

FIG. 7 is a front elevational Vview of the unit shown in FIG. 5 as itwould appear with the door of the unit in open position;

FIG. 8 is' a fragmentary front elevational view of the unit shown inFIG. 5, the door being'in closed position;

FIG. 9 is -jan enlarged tragmentaryvertical sectional view as takensubstantially along the line 9 9 :of FIG. 5,.

f the door beingclosed;

4 FIGS. l0 and l1 are views similar to FIG. 9 but showing the door inpartially open `and fully open positions, respectively; and

FIG. 12 is a fragmentary vertical section view taken along lthe line 12-12 of FIG. 6. A Y f As shown in FIG. l, the storage assembly comprises aplurality of individual roll le units A and B, each such unit having arelatively shallow rectangular or box-like conliguration. The units Aare interconnected in vertical- 3,l63,48b Patr-nitedV Dec. 294, 1964 asimilarly interconnected vertical stack of units B, as

lhereinafter described in detail. Each unit A and B comprises a rigidexternal frame or housing 21, preferably of metal, a plurality ofinternal tubular storage compartments 22 arranged in parallelside-by-side relation within the housing, and a hinged door 23 at thefront of the unit.

The frame or housing 21 of each roll le unit comprises a pair of spacedparallel channels 24 (FIG. 2) having sidewalls 26 with top and bottomflanges 27 and 28, respectively, the channels 24 being rigidly connectedat their opposite ends by front and rear cross members 29 and 31,respectively, to provide a rigid rectangular frame assembly which isopen at its at top and bottom sides (FIG. 5). The front cross member 29includes a front panel 32 (FIG. 7) with inturned top, bottom, and sideanges 33, 34 and 36, respectively, the front panel 32 being providedwith a plurality of openings 35 each aligned with an inwardly extendingtubular flange 37 (FIGS. 9-11) for receiving the front ends of thetubular storage compartments 22. The rear cross member 31 has a rearpanel 33 (FIG. yl2) with inturned top, bottom, and side anges 39, 41,and 42, respectively. The top tlange 39 has a downturned marginalportion provided with slots 40 (FIG. 6) to form llange members 43 (FIGS.6 and l2) which are linclined raerwardly, and the bottom ilange 41 hasan upturned marginal portion provided with similar slots to form flangemembers 44 also inclined rearwardly. The horizontal edges of theinclined flange members 43 and 44 are provided with complementaryarcuate or scalloped upper and lower recesses 46 and 47 (FIG. 6), eachpair of recesses 46-47 being aligned with one of the tubular flanges 37at the front of the frame assembly and receiving the rear ends of thetubular storage compartments 22.

The compartments 22 consist of open-ended tubes, preferably ofsemi-rigid material such as heavy cardboard or fibrous material, and areof such length that when the tubes are inserted into the frame assemblythrough the openings 35 in the front panel 32, the rear ends of thetubes will abut the rear panel 38 while the front ends of the tubes aresupported in the tubular llanges 37 but do not project substantiallybeyond the front panel 32. As will be clear from FIG. l2, duringinsertion of the tubes 22 from the front of the frame assembly, therearwardly inclined flange members 43 and 44 flex slightly rearwardlyand serve to guide o`r cam the rear ends of the tubes into properposition between the scalloped recesses 46-47, thereby facilitatinginstallation of the tubes in the frame assembly. In addition, as shownin FIG. 6, the curvature of the scalloped recesses 46-47 is on a smallerradius and is non-concentric with respect to the curvature of the tubes22 so that the periphery of each tube is engaged by the scalloped edgesat essentiallyl four circumferentially spaced points. This arrangementallows the spaced points of Contact on the scalloped ilanges topenetrate or dig in slightly into the outer surface of the semi-rigidtube material and, because of the rearward inclination of the ilangemembers lTS-44, tends to grip-the tubes to resist withdrawal of thetubes, thereby effectively securing the tubes in assembled relation inthe frame.

The door 23 at the front of each roll le unit comprises a main panel 51(FIGS. 5, 7, and 8) with inwardly extending top, bottom, and sideflanges S2, 53, and 54, respectively,` the Width and height of the doorbeing slightly less than the corresponding dimensions of the` frontpanel 32 of the frame assembly but large enough to enclose and concealthe openings 35 when the door is ly stackedl relation-and the stack isconnected laterally to y turned marginal portion 55 (FIG. 9) adapted toabut the front wall 32 of the frame i-n flat engagement therewith whenthe door is closed. A card or label holder in the form of an elongatedstrip 56 (FIG. 8) is secured horizontally at the lower edge of the doorpanel 51 and has inturned edges 57 for retaining a label 58 foridentification of the contents of the le. the lower edge of the labelholder projects slightly below the bottom edgerof the door to serve as afinger grip for manipulating the door.

A pair of headed studs 61 (FIG. 5) are rigidly secured to the upper endsof the door side flanges 54 so that the inwardly projecting ends of thestuds serve as hinge pins for pivotally mounting the door 23 on a pairof elongated generally L-shaped pivot links 62. The structure andoperation of the hinge mechanism is best illustrated in FIGS. 9-11. Asthere shown, each pivot link 62 comprises a short upright arm portion63, which is apertured at its outermost end to receive one of the hingepins 61, and an elongated rearwardly extending arm portion 64. The armportions 63 which support the door 23 arerdisposed forwardly of thefront panel 32 of the frame, and the arm portions 64 extend rearwardlythrough a pair of slots 66 in the panel 32 and lie closely adjacent andparallel to the frame side walls 26 (FIG. 5). The arm portion 64 of eachpivot link 62 has an offset shoulder 67 at its lower edge for abuttingthe inside of the front panel 32. The portion of the link extendingthrough theslot 66 has relatively slight clearance from the edges of theslot, thereby retaining the lower shoulder 67 behind the panel 32 andpreventing unintentional removal of the links 62 from the slots 66. Theupper edge of each link 62, however, has an offset shoulder 65 whichpermits-removal of the link through the slot 66 when the arm portions ofthe link are tilted downwardly. The innermost end of each arm portion 64is slotted, as at 68, to provide a hook which is connected by a tensionspring 69 to a loop 70 struck upwardly from the bottom ilange 28 of thecorresponding frame side member 24. A similar loop 71 (FIG. 6) is alsoprovided on the top ange 27 so that the side walls 26 of the frame canbe assembled to the front panel 32 with either edge up.

In assembling the door 23 on the frame, the apertured arms 13 of thepivot links 62 are rst slipped onto the hinge pins 61 of the door. Thearm portions 64 of the links are then inserted through the slots 66 inthe front panel 32 and are rocked upwardly at their inner ends to allowthe shoulders 67 to drop behind the panel 32. at the lower edges of theslots 66 and thereby allow the shoulders 65 to clear the upper edges ofthe slots 66, the dimensions of the slots being suicient to permit suchmanipulation. Finally, the springs 69 are connected between the loops 70and the inner hooked ends 68 of the pivot links to complete theassembly. To remove the door 23, the above-described sequence is carriedout in reverse order, ie. the springs 69 are first disconnected from thelinks, the inner ends of the links are rocked upwardly to allow passageof the shoulders 65 through the slots, and the links are then shiftedupwardly to allow the shoulders 67 to pass through the slotsfor completewithdrawal of the links.

In the fully closed position of the door 23, as shown in FIG. 9, thetension of the springs 69 acting through the downwardly inclined vlinks62 holds the door firmly closed with the inner edges of the door flanges52-53-54 and the inner surface of the marginal portion 55 engaging thefront wall 32 of the frame. As will be apparent, the door is thuspivotally suspended on the upright arm portions 63 of the pivot links`62, and the links V62 have their lower edges, designated at 72, inengagement at 73 with the lower edges of the slots 66 for positioningthe door As shown in FIGS. 9-11,

CII

in proper enclosing relation over the compartment openings'35. As willhereinafter appear, the points of engagement 73 constitute a fulcrum fortherlinks 62, the fulcrum being at the innermost ends of the armportions 63 below the pivots 61.

During initial opening movement of the door 23, the

lower edge of the door swings outwardly and upwardly in an arc about thepivots 61. The inner horizontal Corner ofl the door, designated at 74 inFIG. 10, at the juncture between the top yliange 52 and the marginalportion 55 is held by spring tension against the panel 32, and as thedoor 23 continues to open, the hinge pins 61 are displaced outwardly andthe corner 74 slides downwardly along the panel 32. However, since thelinks 62 are prevented from moving outwardly by the shoulders 67,rocking movement of the links occurs so that the links pivot in acounterclockwise direction, as seen in FIGS. 9-11, about a fulcrumdefined by the points of engagement 73 of the lower edges 72 of thelinks with the bottom edges of the slots 66. Thus, the pivots 61 arealso displaced downwardly and outwardly until the FIG. l0 position isreached where the outer arms 63 are in their lowermost pivot positionand the inner arms 64 are in their uppermost pivot position. Suchmovement increases the tension of the spring 69. To provide the requiredclearance for the arm portions 63 of the pivot links during swinging ofthe door, the marginal portion 55 'on the door is notched at its ends,as indicated at 76 in FIG. 5.

As the door is moved beyond the FIG. l() position toward the fully openposition shown in FIG. ll, the springs 69 cause the door to continuesuch movement and the corner 74 to continue to slide downwardly alongthe front panel 32. When the door is fully open the top wall 52 is heldby the springs 69 in rm latwise engagement against the panel 32. Duringthis latter part of the opening movement of the door, the pivot pins 61move inwardly and upwardly to a final position intermediate their FIG. 9and FIG. l0 positions. At the same time the links 62 pivot about theirfulcrum points 73 in the opposite or clockwise direction until the armportions 63 and 64 reach their FIG. l1 positions, intermediate thepositions of FIG. 9 and FIG. l0, with the shoulders 67 still abuttingthe inside of the front panel 32 immediately below the lower edges ofthe slots 66.

To return the door to closed position, the reverse sequence is followedso that the parts shift from their FIG. l1 position to their FIG. l0position with the links 62 rocking first in a counterclockwisedirection. Finally, as the door moves from the FIG. l0 position to theFIG. 9 position, the links 62 pivot in' a clockwise direction until theinner arm portions 64 are inclined downwardly in the manner shown inFIG. 9 with the lower corners of the shoulders 67 abutting the inside ofthe front panel 32.

Thus,`it will be seen that the door is held in both closed and openpositions by spring tension. The links 62 fulcrum solely about theirpivot points 73 during both opening and closing of the door, and thelink construction with the offset upperV and lower shoulders and 67 issuch that unintentional detachment of the door from the frame isprevented but the parts are also readily detachable when desired forreplacement or during initial assembly. As will readily be understood,the spring forces acting at an angle on the inner ends of the pivot arms64 are amplified at the pivot pins 61 because of the different lengthsof the pivotV arms on opposite sides of fulcrum 73.

As previously pointed out, the storage compartment tubes 22 are held attheir inner endsagainst withdrawal from the frame assembly by means ofthe rearwardly inclined scalloped ange members 43 and 44 while the frontends ofthe tubes are supported in the flanges 37 on the front panel 32.In addition, however, it will be seen from FIGS. 7 and 11 thatthe..width of the top flange 52v on the Vdoor is such that when the dooris fully open (FIG. 11Y)\the lower edge of the flange 52 projectsslightly belowv the upper parts of the openings 35 and overlies theouterV Vaxial ends of the tubes 22. Thus, inadvertent removal of storedinthe tubes 22 -and snugly engage the inner surfaces of the tubes. ByYthe present arrangement there is little likelihood of the tubes 22being detachedv from the frame assembly during removal of such articles.Of course, it will be understood that during assembly of the storagedevice the tubes 22 must be mounted in the frame 21 before the door 23is installed.

In FIG. 1, a plurality of roll le units A and B are shown in laterallyand vertically interconnected relation. To hold a group of units instacked relation, each rectangular frame 2,1 of an individual roll tileunit is provided with cooperating pairs of projecting studs andelongated apertures or slots arranged in diagonally opposed relation atthe top and bottom of the unit. Thus, as shown in FIGS. 1, 2, and 5, thetop flange 33 of the front cross member 29 has an upstanding stud 81stone end thereof and an aperture 82 at its opposite end. Similarly, the

` bottom iiange 34 has a depending stud 83 aligned with the aperture 82and an aperture 84 aligned with the stud 81. The top flange 39 and thebottom flange 41 of the rear cross member 31 are likewise provided withcooperating studs 81-83 and apertures 8284 which are diagonally opposedto the studs 81453 and the apertures 82-84 of the cross member 29.

As most clearly shown in FIG. 2, when one unit is stacked above theother, the diagonally opposed depending studs 83-83' of the upper unitare received in the apertures {i2-82' of the lower unit and thediagonally opposed upright studs 81-81 of the lower unit are received inthe aper-tures 84-84 of the upper unit thereby insuring properorientation and stacked alignment of the units regardless of which sideis uppermost.

For securing adjacent units together the channel members 29 of eachframe 21V are provided with a plurality of elongated corner slots 91 and92 (FIG. l) located at the upper and lower junctures between the sidepanels 26 and the upper and lower flanges 27 and 2S, respectively. Whena pair of units are stacked vertically or disposed laterally adjacenteach other, the slots 91-92 are brought in-to alignment eithervertically or horizontally for cooperation with a plurality of U-shapedresilient clips 93 (FIGS. 3 and 4) each of which has a pairof'resiliently spreadable legs 9 4 and 96 and a bight portion 97. Asshown particularly in FIG. 3, when a pair of roll tile units A or a`pair of units B are stacked vertically, the upper corner slots 91 of thelowermost unit are vertically aligned with the lower corner slots 92 ofthe uppermost unit so as to receive the legs of a horizontally insertedclip 93 in each pair of aligned slots 91-92. Thus, the leg 94 of theclip 93 extends into the slot 92 and frictionally grips the flange 23while the clip leg 96 extends into the slot 91 and frictionally gripsthe liange 27, the depth of the slots 92491 inwardly of the flanges28-27 being sutlicient so that the bight portion 97 of the clip 93 isrecessed inwardly from the outer surfaces of the side walls 26, Forretaining the clips 93 in assembled relation on frames, each clip legmay be provided with suitable detent means such as a pair Vof apertures93 in the respective legs adapted to snap into interlocking relationwith complementary bulged projections or dimples 99 in the respectiveflanges 27-28.

In a similar manner, the clips 93 are also used in vertically disposedrelation for laterally connecting the tops and the bottoms ot a stack ofunits A with a stack of unitsl B. Thus, as seen at the left-hand side ofFIG. 3, a clip 93 has been inserted vertically downwardly so that itslegs 9496 extend into a pair of slots 91 of laterally adjacent units Aand B and frictionally grip the parallel inside surfaces of the framewalls 26. The openings 98 in the clip legs may interlock with dimpleslill on the vertical walls Z6 which are similar -to the dimples 99 onthe flanges 2'7-28. Although not shown in FIG. 3, it will be understoodthat a clip 93 may be similarly inserted verticallyupwardly into a pairof'juxtaposed slots 92 at the bottoms of the stacks of A and B units.Thus, the roll file units maybe combined in modular fashion to provide astorage assembly ofV any desired number of vertically and horizontallyarranged units.

Although the invention has Ibeen described above with particularreference to certain specic structural embodiments, it is to beunderstood that various modifications and equivalents maybe resorted towithout departing from the scope of the invention as defined in theappended claims.

I claim:

1. In a roll storage means having a housing with front and rear endportions and a plurality of elongated storage tubes mounted in parallelrelation in said housing between said end portions and having accessopenings at the front end portion of the housing, the improvementcomprising support means at the rear end portion of said housing ingripping engagement with the outer peripheries of said tubes adjacentthe rear ends thereof for resisting axial withdrawal of the tubes fromthe front end portion of the housing, and door structure hingedlysupported at the front end portion of said housing for movement betweenopen and closed positions, said door structure when in open positionhaving a portion thereof partially overlying the front ends of saidtubes thereby further preventing axial withdrawal of said tubes from thefront end portion of said housing through said openings.

2. The structure of claim l further characterized in that said supportmeans comprises rearwardly inclined flange means extending across saidrear end portion oi' said housing transversely of said tubes, said angemeans having arcuate edgewise recesses in which said tubes are disposed,the rearward inclination of said liange means permitting axial insertionof said tubes into said housing through said access openings butpreventing axial withdrawal of said tubes through said openings.

3. The structure of claim l further characterized in that said supportmeans comprises a pair of upper and lower rearwardly inclined flangesextending across the rear portion of said housing, said anges havingarcuate recessed edge portions engaging said tubes at opposite sidesthereof.

4. Roll storage means comprising a housing with front and rear endportions, a plurality of elongated storage tubes disposed in parallelrelation in said housing between said end portions, said front endportion providing access openings to the front ends of said tubes,support means atsaid front end portion of said housing for supportingthe front ends of said tubes, and said rear end portion comprising achannel-shaped member with the web of the channel forming the rear wallof the housing, the flanges of the channel-shaped member extendingforwardly and then bent toward each other and forming lange meansextending transversely across the rear end of said housing and havingedge portions engaging said tubes at the rear ends thereof forsupporting the same and preventing axial withdrawal of said tubesthrough said openings.

5. The structure of claim 4 further characterized in that the bentportions of the flanges of the channel are notched to form a pluralityof pairs of upper and lower flange members constituting said ange means,one pair of flange members for each tube, each pair of ange membersbeing adapted to llex rearwardly on insertion of the tube therebetweenand having edge portions gripping the tube to prevent forward withdrawalof the tube.

6. The structure of claim 5 further characterized in that each of saidedge portions is provided with an arcuate recess of slightly smallerradius than and eccentric to the radius ofthe tube whereby each edgeportion grips the tube at circumferentially spaced points.

7. The structure of claim 4 further characterized in that said pairs ofupper and lower flanges are inclined toward the rear end portion of saidhousing and having opposed arcuate edge recesses in gripping engagementwith said tubes.

8. The structure of claim 4 further characterized in that said supportmeans comprises a plurality of tubular portions extending rearwardlyfrom said openings.

9. A cabinet comprising a housing having a front wall with at least oneaccess opening therein, a door having a front panel and a laterallyextending flange along one edge of said panel, a pair of elongated pivotlinks extending through said wail in fuleruming engagement therewith,pivotal support means swingably supporting said door on said linksadjacent the ends of said one edge and above the point of saidfulcruming engagement and forwardly of said wall, and spring meansinterconnecting said links and said housing rearwardly of said wall,said ange extending laterally outwardly `from said wall when said dooris in closed position with said panel substantially parallel to saidWall, said flange being disposed in atwise contact with said wall whensaid door is in open position with said panel extending laterallyoutwardly from said wall, and said spring means resiliently holding saiddoor in engagement with said wall at all times, said links beinggenerally L-shaped with elongated arm portions extending rearwardly fromsaid wall for connection with said spring means and relatively shorterarm portions extending transversely of said elongated arm portionsforwardly of said wall for pivotally mounting said door, a pair of slotsin said wall with said links extending through said slots, and saidlinks having oifset shoulder portions engageable with the rear side ofsaid wall at the margins of said slots for retaining the links againstforward movement.

10. A cabinet comprising a housing having a front wall with at least oneaccess opening therein, a door disposed forwardly of said wall andhaving a front panel, a flange extending perpendicularly from one edgeof said panel, and an inturned marginal portion on said flange extendingparallel to said panel, the juncture between said flange and saidmarginal portion defining an inner corner on the door, said wall beingprovided with a pair of slots at opposite sides of the housing, a pairof generally L-shaped pivot links extending through said slots andhaving elongated arm portions extending rearwardly from said wall withinsaid housing and relatively short arm portions extending angularly fromsaid elongated arm portions and disposed forwardly of said wall, saidlinks being in fulcruming engagement at the juncture of said long andshort arm portions with said Wall at the edges of said slots,pivotrmeans swingably mounting the door `adjacent the outermost ends ofsaid short arm portions for movement of the door between open and closedpositions, and spring means interconnecting the inner ends of saidelongated arm portions with said housing' for resiliently holding thedoor against said Wall in all positions of the door, said ange extendingperpendicularly from said wall and said marginal portionbeing inflatwise contact with said Wall when the door is in closed positionoverlying the open ends of said tubes, said panel and said marginalportion extending perpendicularly from said wall and said flange beingin i'latwise contact with said wall when the door is in open position,and said corner moving in sliding contact with said wall during openingand closing movements of the door, and the axis of said pivot meansbeing displaced outwardly from said wall during sliding movement of saidcorner along said wall when the door is moved between open and closedpositions thereby effecting rocking movement of said pivot links againstthe action of said spring means.

11. The structure of claim 10 further characterized in that said linkshave offset shoulder portions engageable with the rear side of said Wallat the fulcruming edges of said slots for retaining the links againstforward movement through the slots.

References Cited in the le of this patent UNITED STATES PATENTS 586,238King `luly 13, 1897 964,867 Jensen July 19, 1910 1,410,102 Kehoe Mar.2l, 1922 1,546,387 Kerr July 2l, 1925 1,611,494 Strauss Dec. 21, 19262,254,515 Clark Sept. 2, 1941 2,366,886 Van Tuyl Jan. '9, 1945 2,569,236Hake Sept. 25, 1951 2,579,091 Rinaldo Dec. 18, 1951 2,967,078 StillmanJan. 3, 1961 FOREIGN PATENTS 9,754 Great Britain 1915

1. IN A ROLL STORAGE MEANS HAVING A HOUSING WITH FRONT AND REAR ENDPORTIONS AND A PLURALITY OF ELONGATED STORAGE TUBES MOUNTED IN PARALLELRELATION IN SAID HOUSING BETWEEN SAID END PORTIONS AND HAVING ACCESSOPENINGS AT THE FRONT END PORTION OF THE HOUSING, THE IMPROVEMENTCOMPRISING SUPPORT MEANS AT THE REAR END PORTION OF SAID HOUSING INGRIPPING ENGAGEMENT WITH THE OUTER PERIPHERIES OF SAID TUBES ADJACENTTHE REAR ENDS THEREOF FOR RESISTING AXIAL WITHDRAWAL OF THE TUBES FROMTHE FRONT END PORTION OF THE HOUSING, AND DOOR STRUCTURE HINGEDLYSUPPORTED AT THE FRONT END PORTION OF SAID HOUSING FOR MOVEMENT BETWEENOPEN AND CLOSED POSITIONS, SAID DOOR STRUCTURE WHEN IN OPEN POSITIONHAVING A PORTION THEREOF PARTIALLY OVERLYING THE FRONT ENDS OF SAIDTUBES THEREBY FURTHER PREVENTING AXIAL WITHDRAWAL OF SAID TUBES FROM THEFRONT END PORTION OF SAID HOUSING THROUGH SAID OPENINGS.